Angular 5 JWT Login Authentication Examples Step by Step

What Is JWT?The JWT is an open standard (RFC
7519) that defines a compact and self-contained way for securely transmitting
information between parties as a JSON object. This information can be verified
and trusted because it is digitally signed. JWTs can be signed using a secret
(with the HMAC algorithm) or a public/private key pair using RSA.

In Annular 5, the following steps are used to building authentication and authorization for RESTful APIs and applications. I hope it might help you all-

1.The users send their credentials to the server which is verified by the database credentials. If everything is verified successfully, the JWT is sent back to them.

2.The JWT is saved in the user's browser in local storage or in a cookie and so on.

3.The presence of a JWT saved in the browser is used as an indicator that a user is currently logged in.

4.The expiry time of JWT is continually checked to maintain an authenticated state in the Angular applications.

5.The client side routes are protected and access by authenticated users only.

6.When user sends the XHR requests for APIs, the JWT gets sent an Authorization header using your cookies or Bearer.

7.When XHR requests coming on the server, before send back the responses it’s validated first with configured app's secret keys. If everything is looking good then returns successfully responses other send the back to the bad request.

There are several open source libraries are available for angular which are helps with JWTs and has the ability to Decode the JWT, Authorization header to XHR requests and so on.

JWT Authorization service integration in Angular 5 is used to secure login and logout of the application. Firstly we need to make a POST request for login with username and password.

Let’s start the example steps by steps.

Angular 5 User Model – I have created the user class using the CLI commands and write the User property (as per your requirement).